Tile pilot investigation on the use of UV as an alternative disinfecta
nt to NaOCl was started in 1992 at Trani (South Italy) municipal waste
water treatment plant (335 m(3)/h). The results collected after six mo
nths continuous operation enabled us to compare UV and NaOCl disinfect
ion effectiveness on the basis of secondary effluent characteristics,
quantify photoreactivation effects, evidence possible DBP formation an
d assess costs.